<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>02折叠面板</title>
    <style>
      body {
        background-color: #ccc;
      }

      #app {
        width: 400px;
        margin: 20px auto;
        background-color: #fff;
        border: 4px solid blueviolet;
        border-radius: 1em;
        box-shadow: 3px 3px 3px rgba(0, 0, 0, 0.5);
        padding: 1em 2em 2em;
      }

      #app h3 {
        text-align: center;
      }

      .title {
        display: flex;
        justify-content: space-between;
        align-items: center;
        border: 1px solid #ccc;
        padding: 0 1em;
      }

      .title h4 {
        line-height: 2;
        margin: 0;
      }

      .container {
        border: 1px solid #ccc;
        padding: 0 1em;
      }

      .btn {
        /* 鼠标改成手的形状 */
        cursor: pointer;
      }
    </style>
  </head>

  <body>
    <div id="app">
      <h3>案例：折叠面板</h3>
      <div>
        <div class="title">
          <h4>芙蓉楼送辛渐</h4>
          <span class="btn" @click="close"> 收起 </span>
        </div>
        <div class="container" v-show="poem">
          <p>寒雨连江夜入吴,</p>
          <p>平明送客楚山孤。</p>
          <p>洛阳亲友如相问，</p>
          <p>一片冰心在玉壶。</p>
        </div>
      </div>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          poem: true,
        },
        methods: {
          close() {
            this.poem = !this.poem;
          },
        },
      });
    </script>
  </body>
</html>
